Antenna



FIG. 1 is a perspective view of an antenna showing my new design, the support shown in broken lines for illustrative purposes only;

FIG. 2 is a front elevational view thereof, the rear elevational view being the mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right elevational view thereof; and,

FIG. 6 is a left elevational view thereof. 

The ornamental design for an antenna, as shown and described. 